login/password_change_for_SSO is a SAP Parameter attribute which is used to control Handling of password change enforcements in Single Sign-On situations information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
With password-based logon, the system checks whether the user's password
needs to be changed (for example, because the password is initial or has
expired).
If non-password-based logon variants are used (SSO: SNC, X.509, PAS,
logon ticket), no check is currently made to see whether the user has a
password needing to be changed. This parameter can be used to define the
required system behavior (see the explanations of the values below).
See SAP Parameter Documentation for full SAP documentation for this profile parameter.